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Homework Help: A heat problem

  1. Apr 23, 2005 #1
    Interpret the diagram given for 1000g if substance when heated by a 100W heater. Determine it's melting point, boiling point, and specific heat for each phase, it's heat of vaporization, and its head of fusion.


    I've analyzed the graph and found the melting point to be 60 degrees C and the boiling point to be 120 degrees C. So that part is done.


    I'm trying to use the formula c = (VI delta t) / (n delta T). But I can't come up with c. Since n is the number of moles, I know I need to figure that out. So I tried using the equation 1g = 1 N[a] (N sub a) where N[a] is 6.02E23mol^-1.

    Now, I guess I need to use this formula three times (once for each phase - solid, liquid, and gas).


    I haven't started on theheat of vaporization and heat of fusion. But I don't know if there's a formula to use with this. I'm guessing it has something to do with the fact that it is the amount of energy needed to raise 1kg of a substance into a new phase.
  2. jcsd
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